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The final sample for validating the TRIM-Diabetes was comprised of 507 subjects.
Another improvement of our validation process is that we describe a statistically based approach for determining a threshold (number of sequences per sample) for validating genotypes.
The combined final sample for validating the TRIM-Weight was comprised of 208 subjects and is shown in Table 1. 1 One observation missing 2 One observation was deleted as out of range.
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Soil material was also sterilized by γ-irradiation in order to obtain sterile samples for validating the passive IRT procedure.
The authors described in detail how a LINAC at a standard Radiation Oncology Department from a hospital has been implemented in order to provide samples for validating the performance of a radiogenomic test that could be used for guiding medical countermeasures against acute exposure to ionizing radiations.
Obstacles to the pipeline for diagnostics have been reported at the "front end" i.e. early stages of discovery and development, and also later, with lack of samples for validating and testing biomarkers [ 35].
In the final validation phase, the parameters of the logistic model from the training phase were applied to an independent cohort of 390 samples for validating the diagnostic performance of the selected miRNA panel.
Few articles mentioned that there was no consensus as to how to compute a required sample size for validating a PRO: "Approaches to determining sample size adequacy vary considerably by type and purpose of analysis" (reference 21 in AF1).
Although our study did not aim to develop a prediction model for postoperative AKI and had a small sample size for validating a new model, we could identify that old age and high MELD-Na score were significant risk factors for postoperative AKI after hepatobiliary surgery.
Further, due to insufficient number of samples available for validating PDGFR expression, its correlation with imatinib treatment could not be established [ 21].
However, nearly none of these studies calculate the sample size required for validating these techniques.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com